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03-26-2013, 11:55 PM | #1 |
Scooby Newbie
Member#: 331467
Join Date: Sep 2012
Chapter/Region:
MAIC
Location: Central maryland
Vehicle:2005 WRX Sti CGM |
turbo or wastegate issues???
Forgive me if this has already happened to some one but im having real problems here, i checked around as best as i could oh well...
So heres the deal i have 2005 sti running like 95k miles, i have basically stage 2 full turbo back catless, intake,ap and a greddy type s bypass recirculation if it matters....... I am having boost control issues the cars targeting 17 psi but in first and second i can only hit 11 or 12psi...... 3-6 gear seems to be ok but the higher the rpm the less boost it seems to taper...i know my turbo seals are bad im getting quite a bit of oil in the intercooler but i hear no noises or nothing unusual.... oh and as a side note since the problem occured i have been getting back fire and flames when i get off the gas, i wrote it off as the car is feeding more fuel for the pressure that the turbos not supplying.... i have reflashed the map and tried even going back to stock..... something is wrong idk what Please help!! I can datalog the incidents if needed aswell Thanks
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03-27-2013, 12:22 AM | #2 | |
Scooby Specialist
Member#: 323379
Join Date: Jun 2012
Vehicle:1992 Trans Am |
Quote:
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03-27-2013, 12:35 AM | #3 |
Scooby Newbie
Member#: 331467
Join Date: Sep 2012
Chapter/Region:
MAIC
Location: Central maryland
Vehicle:2005 WRX Sti CGM |
the only thing is before the problem started i was able to hit full boost through all the gears and i was running the same map and everything.... and boost targets are the same through all gears as well, however actual psi is lower
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03-27-2013, 08:54 AM | #4 |
Former Vendor
Member#: 301037
Join Date: Nov 2011
Chapter/Region:
MWSOC
Location: Minneapolis, MN
Vehicle:2004 Forester XT Aspen White |
Are you running a protune or AP OTS?
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03-27-2013, 09:00 AM | #5 |
Scooby Newbie
Member#: 331467
Join Date: Sep 2012
Chapter/Region:
MAIC
Location: Central maryland
Vehicle:2005 WRX Sti CGM |
Off the shelf stage 2 on ap
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03-27-2013, 10:46 AM | #6 |
Scooby Newbie
Member#: 180679
Join Date: May 2008
Location: San Francisco
Vehicle:2005 STI Aspen White |
not sure if relevant, but cobb says not to use catless DPs with their OTS maps
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03-27-2013, 04:51 PM | #7 |
Scooby Specialist
Member#: 316415
Join Date: Apr 2012
Location: Elk Grove, CA
Vehicle:2006 WRX WRB |
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03-28-2013, 10:20 AM | #8 |
Scooby Newbie
Member#: 303849
Join Date: Dec 2011
Chapter/Region:
Tri-State
Location: Big City
Vehicle:2004 Forester Xt Silver stg2 |
YUP I'm havin the same problem too cant hit my target boost of 18 lbs only constant 15lbs . cant seem to find the issue. i smoke tested the car n changed all the vacum lines .
it was protuned hitting 18 lbs for 2 weeks then it stopped thanks henri |
03-28-2013, 11:35 AM | #9 |
Scooby Specialist
Member#: 255114
Join Date: Aug 2010
Chapter/Region:
Tri-State
Vehicle:2015 STi Limited CBS |
check your wastegate actuator and swap out your bcs with a known working one.
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03-28-2013, 12:53 PM | #10 |
Scooby Specialist
Member#: 310506
Join Date: Feb 2012
Chapter/Region:
South East
Location: Florida
Vehicle:2005 WRX STi CGM |
Manual boost controller, or stock?
The only thing that - bar a fubar'd turbo - is going to inhibit that turbo is the wastegate, and/or an exhaust leak. If you run a line directly from the wastegate actuator to the compressor, you should hit boost fine. I performed this test a while ago, and used it to identify a faulty OEM EBCS. Do NOT floor the car, but it will let you know if it is solely the boost controller that is inhibiting boost, or a pre-turbo exhaust leak. |
03-28-2013, 01:02 PM | #11 |
Scooby Specialist
Member#: 316415
Join Date: Apr 2012
Location: Elk Grove, CA
Vehicle:2006 WRX WRB |
Guarantee it's your wastegate actuator. Pop the e clip off, DON'T LOSE THIS CLIP IT TENDS TO SPRING OFF SO KEEO YOUR OPPOSITE HAND ON IT, break the 10mm locking nut. One turn at a time clockwise to tighten actuator arm. Put clip back on lock the nut. Go for a drive. If still not maybe one more turn. There's gotta be a certain amount of preload to keep the wastegate closed until target boost.
Then come back and tell me I'm right. Last edited by Andrewxxcarlson; 03-28-2013 at 01:15 PM. |
03-28-2013, 01:17 PM | #12 | ||
Scooby Specialist
Member#: 310506
Join Date: Feb 2012
Chapter/Region:
South East
Location: Florida
Vehicle:2005 WRX STi CGM |
Quote:
Quote:
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03-28-2013, 01:21 PM | #13 |
Scooby Specialist
Member#: 316415
Join Date: Apr 2012
Location: Elk Grove, CA
Vehicle:2006 WRX WRB |
It's a possibility that it is his bcs, but the same thing happened to me, got tuned, hit full boost for a couple weeks, adjusted 2 turns clockwise to add preload on the wastegate. Hit full boost for 6 months after. I then detuned my car, stage 2 OTS, noticed I was now over boosting. Back the wastegate arm 2 turns counterclockwise everything perfect.
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03-29-2013, 01:22 PM | #14 |
Scooby Newbie
Member#: 331467
Join Date: Sep 2012
Chapter/Region:
MAIC
Location: Central maryland
Vehicle:2005 WRX Sti CGM |
So preloading the wastegate arm may solve the issue..? Or it could be the bcs? Ill try it today when I get a chance and see if I can find someone with a stock bcs I can see if it works
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03-29-2013, 02:10 PM | #15 |
Scooby Specialist
Member#: 316415
Join Date: Apr 2012
Location: Elk Grove, CA
Vehicle:2006 WRX WRB |
Try the wastegate actuator first, it's easily reversible. Takes me about 7 mins including taking off heat shield.
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03-29-2013, 02:14 PM | #16 |
Scooby Newbie
Member#: 315840
Join Date: Apr 2012
Chapter/Region:
Tri-State
Location: New York
Vehicle:2000 2.5rs |
I didn't think the WGA on the VF turbos could be adjusted.
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03-29-2013, 02:21 PM | #17 |
Scooby Specialist
Member#: 316415
Join Date: Apr 2012
Location: Elk Grove, CA
Vehicle:2006 WRX WRB |
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03-29-2013, 11:21 PM | #18 |
Scooby Newbie
Member#: 320444
Join Date: May 2012
Chapter/Region:
NWIC
Location: Spokane, WA
Vehicle:2012 WRX SWP |
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03-30-2013, 12:04 AM | #19 |
Scooby Specialist
Member#: 316415
Join Date: Apr 2012
Location: Elk Grove, CA
Vehicle:2006 WRX WRB |
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03-30-2013, 12:21 AM | #20 |
Scooby Newbie
Member#: 320444
Join Date: May 2012
Chapter/Region:
NWIC
Location: Spokane, WA
Vehicle:2012 WRX SWP |
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03-30-2013, 01:16 AM | #21 |
Scooby Specialist
Member#: 316415
Join Date: Apr 2012
Location: Elk Grove, CA
Vehicle:2006 WRX WRB |
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03-30-2013, 01:24 AM | #22 |
Scooby Newbie
Member#: 320444
Join Date: May 2012
Chapter/Region:
NWIC
Location: Spokane, WA
Vehicle:2012 WRX SWP |
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03-30-2013, 09:43 AM | #23 |
Scooby Specialist
Member#: 310506
Join Date: Feb 2012
Chapter/Region:
South East
Location: Florida
Vehicle:2005 WRX STi CGM |
Any luck op?
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04-01-2013, 08:22 AM | #24 |
Scooby Newbie
Member#: 331467
Join Date: Sep 2012
Chapter/Region:
MAIC
Location: Central maryland
Vehicle:2005 WRX Sti CGM |
No luck thus far... under advisement from cobb im running the HWG mapp and still cant hit full boost however its much closer...... i am noticing that the wastegate arm has play in it when the cars off dont know if it should be that easy to move....? but other than that its looking more and more like i need bcs everything else checks out
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